I got this boat this winter and started working on it to get it ready for the summer.

I've started the boat for the first time this afternoon. It runs fine, but:

1-With my last boat that had a black scorpion engine, when i ran it off the garden hose and open up the throttle a bit, the ''gardian system'' would engage and a beep could be heard (probably because there is not enough water coming off the hose). Not with this boat. Is it normal?

2- The tachometer is NOT working. I've located in the engine bay an harness with a grey wire that says ''tach'', but can't figure out where to hook it up. The is also what appears to be a ground wire (black with a terminal) that comes off the same harness. Any hints on how to get this in working order?? (i'm probably going to need it for the perfect pass in RPM mode, right?)